crank sensor got demolished car still running? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-07-2008, 01:49 AM   #1
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Default crank sensor got demolished car still running?

well to make a long story short. the four bolts on my crank pulley sheared off...... so both belts went flying everywhere and blew up the crank angle.....
i replace the pulley with a 95 pulley and theres no teeth for the magnet to pick up if i would have had a new sensor.. the car is running fine, i have not gone into boost yet but my main question is. the MS i guess does not use the crank angle sensor as a referance for tdc or what? is it fine running with out one? do the obd 1 cars have a crank angle?

just wanted to hear your input on this thanks....
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Old 03-07-2008, 10:28 AM   #2
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I believe the crank angle sensor, only really kicked in with 97's. My 95 does not have a crank angle.... and I don't think the 96's did either. 97's do.... (seen a few).... but I'm not sure if it was set the same as the 99+.......

So depending on the year, shouldn't be a problem.......

Dave,
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Old 03-07-2008, 10:32 AM   #3
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Quote:
Originally Posted by steelrat View Post
I believe the crank angle sensor, only really kicked in with 97's. My 95 does not have a crank angle.... and I don't think the 96's did either. 97's do.... (seen a few).... but I'm not sure if it was set the same as the 99+.......

So depending on the year, shouldn't be a problem.......

Dave,
The 1996 I am taking apart has the crank sensor and "wheel/plate" for the sensor to read from. It was my understanding that the crank sensor started with OBD2, which was required in 1996.
As far as MS, I cannot comment on that... just starting to research about it.
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Old 03-07-2008, 10:43 AM   #4
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Your story is lacking in important details, but it sounds like you have a OBDII generation car running MS standalone? If so, I'd think the MS would only use the CAM angle sensor, and completely ignore the CRANK angle sensor.
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Old 03-07-2008, 10:51 AM   #5
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Quote:
Originally Posted by Ben View Post
Your story is lacking in important details, but it sounds like you have a OBDII generation car running MS standalone? If so, I'd think the MS would only use the CAM angle sensor, and completely ignore the CRANK angle sensor.
+1
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Old 03-07-2008, 12:57 PM   #6
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It's my understanding that the crankwheel sensor was initially implemented only for misfire detection, and that the principal triggering mechanism remained the dual-output CAS. This of course pertains only to the stock ECU. If you have Megasquirt, and you have a CAS, then the crank sensor shouldn't even be wired to anything.
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Old 03-07-2008, 03:47 PM   #7
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well the is a 96 and im running ms1 parrell with stock ecu but controling spark and fuel. so i guess i dont have to replace the crank angle? sounds good... thanks
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Old 03-07-2008, 06:30 PM   #8
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[noob]I thought cam angle sensor and crank angle sensor was the same??? Where's the crank angle sensor? [/noob]
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Old 03-07-2008, 06:49 PM   #9
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Crank angle sensor is on the driver's side of the crank pulley at about 4 o-clock looking at the front of the engine. You can see it here, post #23, third picture, to the left of the blue fitting, three wires.
https://www.miataturbo.net/forum/showthread.php?t=17794
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Old 03-07-2008, 07:04 PM   #10
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Ah, thanks!
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